nice one lucky... in my opinion you would be best off with close quarters domination.. you may not get as many kills as you would in metro, but capping those flags earns loads of points!!! and flag attacker medals come by a lot faster
Also another tip if playing close quarters, either go with assault or support.. with assault you can get loads of revives, but if you can manage with support, chuck out an ammo box every time you cap a flag you'll get loads of resupplies, every 3-4 games youll probably get a medal.
one last thing, if you use the same type of gun throughout the double xp period(for example PDWs, then your likely to get a medal or two from that as well)
hope this helps
P.S make sure to clean out your shit bucket as well!!!